(Noun) A slang term for Time-Signaturitis, a physical condition where the male is unable to achieve and/or withhold an erection without background music that is in alternating 9/8 to 13/8 time signatures

"Ugh, I tried hooked up with this guy last night, but he had Prog Dick; I didn't have any Dream Theater on my iPod, so he walked home with his head hung in shame."